““Everyone should be very grateful radioactivity exists at all. It can kill you, yes, but without it you wouldn't have been born in the first place. On Earth, deep under your feet, our planet happens to contain many atoms that do decay, all the time. Less so now than in the past, but still, Earth's mantle is radioactive. When atoms decay there, the particles they emit bump into their neighbours and generate heat, the very heat that contributes to keeping our planet warm. Without radioactivity, there would be no seismic or volcanic activity. The surface of the Earth would have been dead cold billions of yeras ago. Life as we know it would probably not exist at all.””
![“[Decoding the human genome sequence] is the most significant undertaking…” quote by Francis Collins](https://sms4smile.com/quotes/img-quotes/5c6/francis-collins-5281_atoms_decoding-the-human-genome-sequence-is-th_15604.jpg)
